Fluorescent Dye Testing
Fluorescent Dye Testing - Related Videos
06:48
Antibody Labeling with Fluorescent Dyes Using Magnetic Protein A and Protein G Beads
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Cited by 3 •
2016
The on-bead method for labeling antibodies with small molecules enables labeling of a small amount of antibodies directly from cell media. This method is compatible with amine and thiol chemistry, and can handle multiple samples in parallel, manually or using automated platforms.
05:09
Delivery of a Fluorescent Dye into the Subretinal Space of a Mouse
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2025
Source: Parikh, S., et al. An Alternative and Validated Injection Method for Accessing the Subretinal Space via a Transcleral Posterior Approach. J. Vis. Exp. (2016)This video demonstrates the procedure for delivering a fluorescent dye into the subretinal space of a mouse. The process involves anesthetizing the mouse, preparing the eye, making precise incisions to access the subretinal space, and injecting the dye to create a controlled retinal detachment. This technique allows for targeted...
10:53
Visualizing the Live Drosophila Glial-neuromuscular Junction with Fluorescent Dyes
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Cited by 5 •
2009
We described structural features of the Glia-neuromuscular synapses in a novel Inside-out tissue preparation of live fly larvae using fluorescent dyes with confocal microscopy. We labeled live neuron terminals with fluorescent primary antibodies to HRP, and also visualized the perisynaptic space with fluorescent Dextrans.
06:47
Retrograde Loading of Nerves, Tracts, and Spinal Roots with Fluorescent Dyes
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Cited by 5 •
2012
We describe a simple and low cost technique for introducing high concentration of fluorescent and calcium-sensitive dyes into neurons or any neuronal tract using a polyethylene suction pipette.
04:47
Retrograde Labeling of Drosophila Motor Neurons Using Fluorescent Lipophilic Dyes
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2025
Source: Inal, M. A. et. al., Retrograde Tracing of Drosophila Embryonic Motor Neurons Using Lipophilic Fluorescent Dyes. J. Vis. Exp. (2020)This video demonstrates the method of retrograde labeling of Drosophila motor neurons using lipophilic dyes. The dye enters the axon, travels retrogradely, and labels the neurons green, allowing detailed visualization of their morphology and projections under a confocal microscope.
FAQs
A dye must absorb light within its excitation range before it can produce a detectable signal. The emitted light appears at a longer wavelength, so the optical system must distinguish the incoming excitation light from the fluorescence produced by the labeled sample. Matching the dye and instrument to these wavelength relationships determines whether the target can be observed or measured reliably.
Detection depends on the relationship between the dye’s light-response properties and the capabilities of the fluorescence microscope or other optical instrument. The instrument must provide suitable excitation and collect the longer-wavelength emission from the labeled target. When these conditions align, researchers can examine structures or processes that would be difficult to identify through the target alone.
Fluorescence microscopy can show where a labeled structure or molecule is located within a biological sample, supporting visualization of boundaries, organelles, nucleic acids, and proteins. Other optical instruments can measure the emitted signal, allowing researchers to quantify labeled targets or changes in cellular conditions. Thus, the same general approach can provide spatial information or numerical measurements.
Applications can focus on cell boundaries, organelles, nucleic acids, proteins, or changing cellular conditions. Labeling these targets helps reveal their location, presence, or behavior in a biological sample. In cell biology, the resulting observations can support studies of cell function, molecular interactions, viability, and responses to experimental conditions.
A typical workflow begins by selecting a light-responsive dye that can label the biological target of interest. The labeled sample is then illuminated at an appropriate excitation wavelength, and the emitted light is collected with fluorescence microscopy or another optical instrument. Researchers finally visualize the signal or use it to quantify the target or cellular response.
The essential components are a fluorescent dye, a biological sample containing the target, and an optical system capable of delivering excitation light and detecting the resulting emission. Fluorescence microscopy is suitable when researchers need visual localization, whereas other optical instruments can support measurement. The selected equipment should match the dye’s excitation and emission behavior.
This approach is useful when the research question concerns where a structure or molecule is located, whether cells remain viable, or how cellular conditions change. It can also support measurements of molecular interactions and biological responses. Because the method offers sensitive and relatively rapid optical readouts, it is applicable to basic research, diagnostics, and response evaluation.
Results may show the location of labeled structures, indicate the presence of selected biological targets, or provide measurements associated with cellular conditions. Depending on the instrument, researchers can obtain images, fluorescence-based quantitative values, or evidence of molecular interactions. These outcomes help connect optical signals with cell function, viability, and biological responses.